ContainedMaps( paramap )
returns the set of all maps contained in the parametrized map paramap.
ContainedMaps is the inverse function of Parametrized in the sense that
Parametrized( ContainedMaps( paramap ) ) = paramap.
    gap> ContainedMaps( [ 1, 3, 4, [ 6, 7 ], 8, 10, [ 11, 12 ], [ 11, 12 ],
    > 14, 15 ] );
    [ [ 1, 3, 4, 6, 8, 10, 11, 11, 14, 15 ],
      [ 1, 3, 4, 6, 8, 10, 11, 12, 14, 15 ],
      [ 1, 3, 4, 6, 8, 10, 12, 11, 14, 15 ], 
      [ 1, 3, 4, 6, 8, 10, 12, 12, 14, 15 ],
      [ 1, 3, 4, 7, 8, 10, 11, 11, 14, 15 ],
      [ 1, 3, 4, 7, 8, 10, 11, 12, 14, 15 ], 
      [ 1, 3, 4, 7, 8, 10, 12, 11, 14, 15 ],
      [ 1, 3, 4, 7, 8, 10, 12, 12, 14, 15 ] ]
GAP 3.4.4